The uncertain climate footprint of wetlands under human pressure

Research output: Contribution to journalArticle


title = "The uncertain climate footprint of wetlands under human pressure",
abstract = "Significant climate risks are associated with a positive carbon-temperature feedback in northern latitude carbon-rich ecosystems, making an accurate analysis of human impacts on the net greenhouse gas balance of wetlands a priority. Here, we provide a coherent assessment of the climate footprint of a network of wetland sites based on simultaneous and quasi-continuous ecosystem observations of CO2 and CH4 fluxes. Experimental areas are located both in natural and in managed wetlands and cover a wide range of climatic regions, ecosystem types, and management practices. Based on direct observations we predict that sustained CH4 emissions in natural ecosystems are in the long term (i.e., several centuries) typically offset by CO2 uptake, although with large spatiotemporal variability. Using a space-for-time analogy across ecological and climatic gradients, we represent the chronosequence from natural to managed conditions to quantify the {"}cost{"} of CH4 emissions for the benefit of net carbon sequestration. With a sustained pulse-response radiative forcing model, we found a significant increase in atmospheric forcing due to land management, in particular for wetland converted to cropland. Our results quantify the role of human activities on the climate footprint of northern wetlands and call for development of active mitigation strategies for managed wetlands and new guidelines of the Intergovernmental Panel on Climate Change (IPCC) accounting for both sustained CH4 emissions and cumulative CO2 exchange.",
author = "Petrescu, {Ana Maria Roxana} and Annalea Lohila and Juha-Pekka Tuovinen and Baldocchi, {Dennis D} and Desai, {Ankur R} and Roulet, {Nigel T} and Timo Vesala and Dolman, {Albertus Johannes} and Oechel, {Walter C} and Barbara Marcolla and Thomas Friborg and Janne Rinne and Matthes, {Jaclyn Hatala} and Lutz Merbold and Ana Meijide and Gerard Kiely and Matteo Sottocornola and Torsten Sachs and Donatella Zona and Andrej Varlagin and Lai, {Derrick Y F} and Elmar Veenendaal and Frans-Jan Parmentier and Ute Skiba and Magnus Lund and Arjan Hensen and {van Huissteden}, Jacobus and Flanagan, {Lawrence B} and Shurpali, {Narasinha J} and Thomas Gr{\"u}nwald and Humphreys, {Elyn R} and Marcin Jackowicz-Korczynski and Aurela, {Mika A} and Tuomas Laurila and Carsten Gr{\"u}ning and Corradi, {Chiara A R} and Schrier-Uijl, {Arina P} and Torben Christensen and Tamstorf, {Mikkel P} and Mikhail Mastepanov and Martikainen, {Pertti J} and Verma, {Shashi B} and Christian Bernhofer and Alessandro Cescatti",
year = "2015",
doi = "10.1073/pnas.1416267112",
language = "English",
volume = "112",
pages = "4594--4599",
journal = "Proceedings of the National Academy of Sciences",
issn = "1091-6490",
publisher = "National Acad Sciences",
number = "15",